Ikelite Underwater Housing Canon 5D Mark III, 5D Mark IV, 5DS & 5DS-R 200DL Tovatec The plug of this spare

The plug of this spare port may be replaced with this vacuum valve

Aquatica Focus Gear #49016 for Canon EF-S 60mm f/2

AOI PRC-01 Rear Port Cap for Olympus OM-D Mount

with the key difference being its removable 52 mm thread

Aquatica Micro 4/3 Series Port Extension Ring 58mm

Ikelite Underwater Housing Canon 5D Mark III, 5D Mark IV, 5DS & 5DS-R 200DL Tovatec The plug of this spareIkelite 200DL Underwater Housing for Canon EOS 5D Mark III, 5D Mark IV, 5DS, 5DS R DSLR Cameras A full featured and durable waterproof housing for Canon EOS 5D Mark III, 5D Mark IV, 5DS, and 5DS R DSLR cameras. Suitable for scuba diving, snorkelling, surfing, pools, and any application in or around water. Overview Canon's prolific full frame DSLR in one of the best selling underwater housings to date. Feature Details Controls Controls are provided for